Seeking advice on sulfur recovery processes in liquids
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For a wastewater treatment project whose wastewater contains high concentrations of S2-, my initial approach was to oxidize it to recover sulfur, but solid-liquid separation after oxidation proves to be very difficult. How do you all do it? Let’s discuss :)
The removal mechanism of S2- using magnesium-aluminum bimetallic hydroxides involves surface adsorption of HS- and its oxidation to S2O32-. When MgAl-LDO is used as a precursor, HS- can rapidly enter the interlayer spaces through the LDO structure; influenced by the catalytic oxidation properties of MgAl-LDO, HS- is oxidized to S2O32-, S2-, and S3- simultaneously during the structural restoration process, thereby enabling efficient removal of S2- from the solution. The product MgAl-LDO, obtained by calcining LDHs with a Mg/NAl ratio of 2 at 500°C, can achieve a removal efficiency of over 98% for S2-. The use of MgAl-LDO for the removal of S2- can thus be considered an effective method for this purpose.
Reply to 2# Cao Jingcheng: Thank you. The adsorption-oxidation method is efficient, but its cost is too high. I would prefer to be able to recover sulfur.